P2156 2016 GMC Sierra Code - Cylinder 4 Injector High Control Circuit Low Voltage
Quick Answer
The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P2156 2016 GMC Sierra indicates Cylinder 4 Injector High Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P2156 2016 GMC Sierra Description
What are the Possible Causes of the DTC P2156 2016 GMC Sierra?
- Faulty Fuel Injector 4
- Fuel Injector 4 harness is open or shorted
- Fuel Injector 4 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2156 2016 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2156 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P2156 2016 GMC Sierra code?
Need more information on how to fix the P2156 2016 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P2156 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P2156 2016 GMC Sierra Code
What does the OBDII code P2156 mean on a 2016 GMC Sierra?
P2156 indicates a problem with the Cylinder 4 Injector High Control Circuit, specifically a low voltage condition detected by the powertrain control module (PCM).
What are the common symptoms of code P2156 in a 2016 GMC Sierra?
Symptoms may include poor engine performance, misfires, reduced fuel efficiency, rough idling, and the check engine light turning on.
What causes the P2156 code to appear on a 2016 GMC Sierra?
Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a bad PCM, or corrosion in the electrical connections.
Can I drive my 2016 GMC Sierra with a P2156 code?
It’s not recommended to drive with this code active, as it can lead to poor engine performance, potential damage to other components, and unsafe driving conditions.
How is the P2156 code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the wiring and connectors for damage or corrosion, and test the cylinder 4 fuel injector for proper operation.
What repairs are needed to fix the P2156 code?
Repairs might include replacing the cylinder 4 fuel injector, repairing or replacing damaged wiring, cleaning corroded connectors, or, in rare cases, replacing the PCM.
How much does it cost to fix the P2156 code on a 2016 GMC Sierra?
Repair costs vary, but replacing a fuel injector typically costs $150–$300 for parts and labor, while wiring repairs or PCM replacement could be more expensive.
Can a dirty fuel system cause the P2156 code?
While not a primary cause, a dirty fuel system could contribute to injector issues. Cleaning the fuel system may help if the injector is partially clogged.
How can I prevent the P2156 code from recurring?
Regular maintenance, such as inspecting electrical connections, cleaning the fuel system, and using quality fuel, can help prevent injector-related issues.
Does the P2156 code require reprogramming the PCM?
Reprogramming the PCM is usually not necessary unless it is determined to be faulty or has outdated software contributing to the issue.
Discuss the causes and fixes for P2156 2016 GMC Sierra OBDII Code
Code P2156 2016 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
